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Finding the Fourth Proportional to 392.73, 589.08 and 118.81

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Solution

The fourth proportional to 392.73, 589.08 and 118.81 is: 178.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.73 : 589.08 = 118.81 : x
  2. Step 2: Convert to fraction form
    392.73/589.08 = 118.81/x
  3. Step 3: Cross multiply
    392.73x = 589.08 × 118.81
  4. Step 4: Simplify right side
    392.73x = 69,988.59
  5. Step 5: Solve for x
    x = 69,988.59/392.73
  6. Step 6: Final answer
    x = 178.21

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.